linux-kernel - Re: IO CPU affinity test results

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Message-ID: <47DA9FD7.1070602@hp.com>
Date:	Fri, 14 Mar 2008 11:55:03 -0400
From:	"Alan D. Brunelle" <Alan.Brunelle@...com>
To:	"Alan D. Brunelle" <Alan.Brunelle@...com>
Cc:	Jens Axboe <jens.axboe@...cle.com>, linux-kernel@...r.kernel.org,
	npiggin@...e.de, dgc@....com
Subject: Re: IO CPU affinity test results

4-way IA64, better, but not good after 30 runs (in single user mode):

Part  RQ   MIN     AVG     MAX      Dev
----- --  ------  ------  ------  ------
 mkfs 0  18.893  19.429  20.129   0.351
 mkfs 1  18.912  19.347  19.934   0.258

untar 0  17.007  17.538  18.829   0.416
untar 1  16.980  17.329  18.369   0.284

 make 0  22.050  23.000  23.546   0.400
 make 1  22.416  23.141  23.637   0.349

 comb 0  58.138  59.967  61.923   0.793
 comb 1  58.428  59.817  60.750   0.608

 psys 0   7.69%   8.77%   9.93%   0.443
 psys 1   8.47%  14.20%  16.33%   2.566

Better run time w/ rq=1 (only 0.25%) but at a huge cost in %sys. Will do some profiling to see what's up.

Alan
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